Arguably the happiest of all music is Dixieland jazz. The sound of several horns all improvising together on fairly simple chord changes with definite roles for each instrument but a large amount of freedom, cannot help but sound consistently joyful. (Scott Yanow)Du Noyer, Paul (2003). The Illustrated Encyclopedia of Music (1st ed.) Fulham London: Flam Tree publishing p. 124. ISBN 1-904041-96-5.